package com.itheima.exception;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class ExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest,
                                         HttpServletResponse httpServletResponse,
                                         Object o, Exception ex) {
        System.out.println("HandlerExceptionResolver has handle ....");
        ex.printStackTrace();

        ModelAndView modelAndView = new ModelAndView();
        if (ex instanceof NullPointerException) {
            modelAndView.addObject("msg", "空指针异常");
        } else if (ex instanceof ArithmeticException) {
            modelAndView.addObject("msg", "算数运算异常");
        } else {
            modelAndView.addObject("msg", "未知的异常");
        }
        modelAndView.setViewName("error.jsp");
        return modelAndView;
    }
}
